The fragmentation and its mechanism of the uncoupled charge structure with segmental explosive

Abstract

Charge structure, which can instantly release much energy, is a significant research point in explosive protection and warhead. The distribution of the fragment velocity from uncoupled charge structures with segmental shaped explosive were studied. Numerical calculation research was carried out based on the CEL method. The X-ray photographic images of fragmentation were obtained from explosion experiment, which provided experimental support for numerical simulation research. The results show that the fragmentation and velocity distribution of the charge structure with segmental explosive show obvious segmental characteristics compared with the traditional cylindrical shell charge. The explosive loadings of the shell under uncoupled conditions is not only determined by the detonation wave and the static pressure of the detonation products but by the impact dynamic pressure of the detonation products at low pressure and high speed and the static pressure generated by the detonation products expansion and convergence, leading to the significant difference among the coupled side, the uncoupled side and the transition area. In this paper, the fragmentation and velocity distribution of the charge with segmental explosive was obtained, the uncoupled explosive driving mechanism was investigated and verified. The conclusion provides a foundation for exploring and establishing the uncoupled explosive driving theory.

Keywords

• Fragmentation
• Uncoupled charge
• X-ray radiography
• CEL numerical method